examples/dice.sh: adapt to work on QNX 6.5.0
examples/dice.sh: adapt to work on QNX 6.5.0

/usr/bin/printf on QNX 6.5.0 is broken: it cannot handle repeating
a single %pattern with multiple arguments as POSIX specifies. Some
shells (eg. mksh) don't have a builtin printf, so dice.sh breaks.

/usr/bin/od on QNX 6.5.0 is also somewhat broken: it cannot read
directly from /dev/urandom with a file name argument.

share/doc/modernish/examples/dice.sh:
- Convert use of 'printf' to modernish 'putln'.
- randomDiceStream(): Use shell input redirection to read from
  /dev/urandom, instead of passing a file name argument to 'od'.

(thanks to polarhome.com for providing a QNX shell account)

modernish/modernish